Patent PL-1729077-T3 (PL)
Title: Process and device for the recovery of products from synthesis gas
Inventor: LANG MARTIN
IPC: C01B32/40
Filed: 2006-05-30
Abstract: The production of a gaseous carbon monoxide product stream is carried out by decomposition of a feedstock stream (1) composed of hydrogen and carbon monoxide in a cryogenic gas decomposition unit by cooling through indirect heat exchange against a heating process stream. CO-rich and H 2-containing condensate is formed by a single-step partial condensation. H 2-rich and CO-containing gas fraction (flash gas) is separated by a cryogenic fractioning of the condensate in a separating column (T). A liquid CO (11) with product purity is extracted as a sump product in the separating column. The production of a gaseous carbon monoxide product stream is carried out by decomposition of a feedstock stream (1) composed of hydrogen and carbon monoxide in a cryogenic gas decomposition unit by cooling through indirect heat exchange against a heating process stream. CO-rich and H 2-containing condensate is formed by a single-step partial condensation. H 2-rich and CO-containing gas fraction (flash gas) is separated by a cryogenic fractioning of the condensate in a separating column (T). A liquid CO (11) with product purity is extracted as a sump product in the separating column and evaporated, heated and led into a CO compressor (C1). A gaseous CO is compressed by compressor sections at product pressure and the liquid CO is cooled against the heating process stream and split up into partial streams, which are relaxed at a pressure level against a cooling process stream. The liquid CO partial streams are released at the suction face of another compressor section. The liquid CO from the sump of the separating column is strongly under cooled at the lowest pressure level to form a liquid-gas mixture separated in a separator (D1) during the relaxation. The H 2-rich and CO-containing gas phase is heated through indirect heat exchange against cooling process streams. The feedstock stream for the cryogenic gas-separating unit is produced from a synthetic gas by cleaning in a CO 2washing and an adsorbent station (A). The H2-rich and CO-containing gas fraction is used for the recycling of the adsorbents in the adsorbent station after warming up. The gas fraction is separated into a hydrogen fraction and a CO/H 2mixture in a membrane unit. The hydrogen fraction is used for the recycling of the adsorbents and the CO/H2 mixture is employed for the extraction of carbon monoxide after cooling against heating process streams of the column. An impure gas from adsorbent station used for the recovery of the adsorbent is cleaned in a pressure variable adsorbent station and delivered at a battery limits. A rest gas (37) from the pressure variable adsorption station is led back into the synthesis gas before the CO 2washing. Liquid nitrogen is supplied from beyond the battery limits for cooling process and evaporated in a heat exchanger (E1), which is integrated in the separator and a part of the CO contained in the gas fractioning group is condensed. An independent claim is included for device for production of a gaseous carbon monoxide product stream.